XYZ Company is concerned about the weekly meal allowance from their sales team. Ramdom survey has been done on 12 sales people from the team. Following is the result collected from the survey by HR department.
34, 50, 46, 48, 48, 29, 30, 38, 35, 40, 28, 32
Show the formula and step for:
i. estimate population means with 9%% confidence level. Allowance claim is normally distribution
ii. Management not satisfy with the sampling outcome. Refer to 'i' standard deviation obtained, get the number of samples required so that for 9%% confidence lever will generate a margin of error of 2.